165415971 has 16 divisors (see below), whose sum is σ = 260755200. Its totient is φ = 91263648.

The previous prime is 165415951. The next prime is 165415973. The reversal of 165415971 is 179514561.

It is not a de Polignac number, because 165415971 - 2²² = 161221667 is a prime.

It is not an unprimeable number, because it can be changed into a prime (165415973) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 135201 + ... + 136418.

It is an arithmetic number, because the mean of its divisors is an integer number (16297200).

Almost surely, 2^165415971 is an apocalyptic number.

165415971 is a deficient number, since it is larger than the sum of its proper divisors (95339229).

165415971 is a wasteful number, since it uses less digits than its factorization.

165415971 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 271658.

The product of its digits is 37800, while the sum is 39.

The square root of 165415971 is about 12861.4140357894. The cubic root of 165415971 is about 548.9411816840.

The spelling of 165415971 in words is "one hundred sixty-five million, four hundred fifteen thousand, nine hundred seventy-one".